<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>CSS控制视频的宽高</title>
  <style>
    *{
      margin: 0;
      padding: 0;
    }
    div{
      width: 600px;
      height: 300px;
      border: 1px solid #000;
    }
    video{
      width: 200px;
      height: 300px;
      background: #9CCDCD;
      float: left;
    }
    p{
      width: 200px;
      height: 300px;
      background: #999;
      float: left;
    }
  </style>
</head>
<body>
<div>
  <p>占位色块</p>
  <video src="" controls="controls">浏览器不支持video标签</video>
  <p>占位色块</p>
</div>
</body>
</html>